Hi Harris,

To union tables manually

1. On the data source page, double-click New Union to set up the union.

1. Drag a table from the left pane to the Union dialog box.

1. Select another table from the left pane and drag it directly below the first table.

Tip: To add multiple tables to a union at the same time, press Shift or Ctrl (Shift or Command on a Mac), select the tables you want to union in the left pane, and then drag them directly below the first table.

1. Click Apply or OK to union.

Keep on Tableau-ing!